I have two broody hens. One was sitting on four eggs for the last week. Today my sons got into the coop and removed the eggs and broke them. The chicks were growing. It was sad. I was wondering if I can slip some chicks under her instead of taking the chance that she would abandon the nest before the new eggs hatch. Is it too soon to do that? She's been broody for about two weeks now. The second hen has only been broody for about four days. Can they tell that they havnt been sitting long enough to hatch them?